We’re on the sidewalk at the west end of Waller St, a stone’s throw from Golden Gate Park and the final stop of our two-hour walking tour of San Francisco’s Haight-Ashbury district. Our genial tour guide Kurt, a chubby, moustachioed, local comedian and film maker points out a converted firehouse across the road at number 1575 where in April 1967, representatives of the local alternative community held a press conference

Roll up, roll up for a London rock’n’roll magical mystery tour ‘See the window on the first floor – on the left – that’s the bathroom. There’s a drainpipe on the side wall – you can’t quite see it from here—but two girls climbed up there and got in. They took two of Paul’s shirts which he was a bit annoyed about. And that’s what gave him the inspiration to